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This net settlement was approved by the board of directors of the Issuer pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended."}],"balance_after":74390,"source":{"system":"sec-edgar","filing":"0001628280-26-060774","document":"wk-form4_1788558750.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2035162/000162828026060774/wk-form4_1788558750.xml","form_type":"4"}},{"id":4833,"issuer":{"id":1446,"kind":"organization","name":"HMH Holding Inc","symbol":"HMH"},"owners":[{"id":1452,"kind":"person","name":"Dyrseth Roy A.","position":1,"cik":"0002035162","reported_name":"Dyrseth Roy A.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-04T21:52:33.000Z","date":"2026-09-03","kind":"grant","planned":false,"acquired":true,"shares":10927,"price":19.26,"value":210454.02,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On April 2, 2026, the reporting person was granted 10,927 performance-based restricted stock units, each of which represented a contingent right to receive one share of Class A common stock, par value $0.01 per share, of HMH Holding Inc. (the \"Issuer\"). The restricted stock units could be earned up to 200% of target depending on the Issuer's EBITDA growth as compared to the EBITDA growth of a set of peer companies over the three-year period from September 1, 2023 through August 31, 2026 and subject to the reporting person's continued service throughout such three-year period. On September 3, 2026, the Compensation Committee of the Board of Directors of the Issuer certified achievement of the performance condition at 50%, resulting in the restricted stock units originally granted becoming earned at 100% of the target amount granted."}],"balance_after":79570,"source":{"system":"sec-edgar","filing":"0001628280-26-060774","document":"wk-form4_1788558750.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2035162/000162828026060774/wk-form4_1788558750.xml","form_type":"4"}},{"id":1771,"issuer":{"id":1446,"kind":"organization","name":"HMH Holding Inc","symbol":"HMH"},"owners":[{"id":1452,"kind":"person","name":"Dyrseth Roy A.","position":1,"cik":"0002035162","reported_name":"Dyrseth Roy A.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-03T18:16:51.000Z","date":"2026-09-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":4145,"price":19.26,"value":79832.7,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of Class A common stock, par value $0.01 per share of the Issuer withheld to satisfy tax withholding obligations upon the vesting of restricted stock units. This net settlement was approved by the board of directors of the Issuer pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended."}],"balance_after":68643,"source":{"system":"sec-edgar","filing":"0001628280-26-060321","document":"wk-form4_1788459408.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2035162/000162828026060321/wk-form4_1788459408.xml","form_type":"4"}},{"id":729332,"issuer":{"id":1446,"kind":"organization","name":"HMH Holding Inc","symbol":"HMH"},"owners":[{"id":1452,"kind":"person","name":"Dyrseth Roy A.","position":1,"cik":"0002035162","reported_name":"Dyrseth Roy A.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Class A Common Stock","published_at":"2026-06-23T22:38:50.000Z","date":"2026-06-19","kind":"grant","planned":false,"acquired":true,"shares":18757,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents restricted stock units granted to the reporting person under the HMH Holding Inc. 2026 Long-Term Incentive Plan on June 19, 2026. Each restricted stock unit represents a contingent right to receive one share of Class A Common Stock. The restricted stock units vest in three equal installments on September 19, 2027, June 19, 2028 and June 19, 2029."}],"balance_after":72788,"source":{"system":"sec-edgar","filing":"0001193125-26-279898","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2021880/000119312526279898/ownership.xml","form_type":"4"}},{"id":729331,"issuer":{"id":1446,"kind":"organization","name":"HMH Holding Inc","symbol":"HMH"},"owners":[{"id":1452,"kind":"person","name":"Dyrseth Roy A.","position":1,"cik":"0002035162","reported_name":"Dyrseth Roy A.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Class A Common Stock","published_at":"2026-06-23T22:38:50.000Z","date":"2026-05-18","kind":"tax_withholding","planned":false,"acquired":false,"shares":26713,"price":19.28,"value":515026.64,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of Class A common stock, par value $0.01 per share (\"Class A Common Stock\"), of HMH Holding Inc. (the \"Issuer\") withheld to satisfy tax withholding obligations upon the vesting of restricted stock units. This net settlement was approved by the board of directors of the Issuer pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended."}],"balance_after":54031,"source":{"system":"sec-edgar","filing":"0001193125-26-279898","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2021880/000119312526279898/ownership.xml","form_type":"4"}},{"id":788640,"issuer":{"id":1446,"kind":"organization","name":"HMH Holding Inc","symbol":"HMH"},"owners":[{"id":1452,"kind":"person","name":"Dyrseth Roy A.","position":1,"cik":"0002035162","reported_name":"Dyrseth Roy A.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Class A Common Stock","published_at":"2026-05-07T18:56:35.000Z","date":"2026-05-05","kind":"grant","planned":false,"acquired":true,"shares":12468,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units granted to the reporting person under the HMH Holding Inc. 2026 Long-Term Incentive Plan on May 5, 2026. Each restricted stock unit represents a contingent right to receive one share of Class A common stock, par value $0.01 per share, of HMH Holding Inc. (the \"Issuer\"). Due to an administrative error in the calculation of equity awards granted on April 2, 2026, fewer restricted stock units were granted to the reporting person than were approved by the Board of Directors of the Issuer to be granted on that date. This grant represents a true-up award to align the number of restricted stock units granted with the amounts originally approved."},{"field":"shares","element":"transactionShares","label":"F2","text":"(Continued from footnote 1) The restricted stock units include 9,659 restricted stock units that vested immediately upon grant, 624 restricted stock units that vest on September 1, 2026, 874 restricted stock units that vest in two equal annual installments on September 1, 2026 and September 1, 2027 and 1,311 restricted stock units that vest in three equal annual installments on September 1, 2026, September 1, 2027 and September 1, 2028."}],"balance_after":80744,"source":{"system":"sec-edgar","filing":"0001193125-26-211531","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2021880/000119312526211531/ownership.xml","form_type":"4"}},{"id":814608,"issuer":{"id":1446,"kind":"organization","name":"HMH Holding Inc","symbol":"HMH"},"owners":[{"id":1452,"kind":"person","name":"Dyrseth Roy A.","position":1,"cik":"0002035162","reported_name":"Dyrseth Roy A.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Class A Common Stock","published_at":"2026-04-06T18:50:19.000Z","date":"2026-04-02","kind":"purchase","planned":false,"acquired":true,"shares":8000,"price":20,"value":160000.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents shares of Class A Common Stock purchased by the reporting person through the directed share program conducted in connection with the Issuer's initial public offering."}],"balance_after":68276,"source":{"system":"sec-edgar","filing":"0001193125-26-143538","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2021880/000119312526143538/ownership.xml","form_type":"4"}},{"id":814607,"issuer":{"id":1446,"kind":"organization","name":"HMH Holding Inc","symbol":"HMH"},"owners":[{"id":1452,"kind":"person","name":"Dyrseth Roy A.","position":1,"cik":"0002035162","reported_name":"Dyrseth Roy A.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Class A Common Stock","published_at":"2026-04-06T18:50:19.000Z","date":"2026-04-02","kind":"grant","planned":false,"acquired":true,"shares":60276,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units granted to the reporting person under the HMH Holding Inc. 2026 Long-Term Incentive Plan on April 2, 2026. Each restricted stock unit represents a contingent right to receive one share of Class A common stock, par value $0.01 per share (\"Class A Common Stock\"), of HMH Holding Inc. (the \"Issuer\"). The restricted stock units include 46,695 restricted stock units that vested immediately upon grant, 3,018 restricted stock units that vest on September 1, 2026, 4,225 restricted stock units that vest in two equal annual installments on September 1, 2026 and September 1, 2027 and 6,338 restricted stock units that vest in three equal annual installments on September 1, 2026, September 1, 2027 and September 1, 2028."}],"balance_after":60276,"source":{"system":"sec-edgar","filing":"0001193125-26-143538","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2021880/000119312526143538/ownership.xml","form_type":"4"}}]}